| TITLE: KASAN: use-after-free Read in cma_cancel_operation |
| |
| syzkaller login: [ 23.820987] ================================================================== |
| [ 23.828498] BUG: KASAN: use-after-free in __list_del_entry_valid+0x144/0x150 |
| [ 23.835671] Read of size 8 at addr ffff8801b94cef60 by task syzkaller058671/4231 |
| [ 23.843174] |
| [ 23.844778] CPU: 0 PID: 4231 Comm: syzkaller058671 Not tainted 4.16.0-rc6+ #366 |
| [ 23.852196] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 |
| [ 23.861534] Call Trace: |
| [ 23.864208] dump_stack+0x194/0x24d |
| [ 23.867823] ? arch_local_irq_restore+0x53/0x53 |
| [ 23.872471] ? show_regs_print_info+0x18/0x18 |
| [ 23.876944] ? rcu_note_context_switch+0x710/0x710 |
| [ 23.881852] ? __list_del_entry_valid+0x144/0x150 |
| [ 23.886673] print_address_description+0x73/0x250 |
| [ 23.891488] ? __list_del_entry_valid+0x144/0x150 |
| [ 23.896312] kasan_report+0x23c/0x360 |
| [ 23.900093] __asan_report_load8_noabort+0x14/0x20 |
| [ 23.904998] __list_del_entry_valid+0x144/0x150 |
| [ 23.909648] cma_cancel_operation+0x455/0xd60 |
| [ 23.914117] ? finish_task_switch+0x182/0x7e0 |
| [ 23.918594] ? find_held_lock+0x35/0x1d0 |
| [ 23.922632] ? rdma_destroy_id+0xda0/0xda0 |
| [ 23.926843] ? rdma_destroy_id+0xf4/0xda0 |
| [ 23.930970] ? lock_downgrade+0x980/0x980 |
| [ 23.935097] ? lock_release+0xa40/0xa40 |
| [ 23.939055] ? do_raw_spin_trylock+0x190/0x190 |
| [ 23.943704] ? _raw_spin_unlock_irqrestore+0x31/0xc0 |
| [ 23.948788] ? trace_hardirqs_on_caller+0x421/0x5c0 |
| [ 23.953784] rdma_destroy_id+0xff/0xda0 |
| [ 23.957731] ? lock_release+0xa40/0xa40 |
| [ 23.961681] ? lock_downgrade+0x980/0x980 |
| [ 23.965811] ? cma_release_dev+0x350/0x350 |
| [ 23.970033] ? radix_tree_delete_item+0x146/0x280 |
| [ 23.974873] ucma_close+0x100/0x2f0 |
| [ 23.978475] ? ucma_free_ctx+0xd90/0xd90 |
| [ 23.982521] __fput+0x327/0x7e0 |
| [ 23.985783] ? fput+0x140/0x140 |
| [ 23.989046] ? check_same_owner+0x320/0x320 |
| [ 23.993341] ? _raw_spin_unlock_irq+0x27/0x70 |
| [ 23.997814] ____fput+0x15/0x20 |
| [ 24.001074] task_work_run+0x199/0x270 |
| [ 24.004938] ? task_work_cancel+0x210/0x210 |
| [ 24.009235] ? _raw_spin_unlock+0x22/0x30 |
| [ 24.013357] ? switch_task_namespaces+0x87/0xc0 |
| [ 24.018007] do_exit+0x9bb/0x1ad0 |
| [ 24.021448] ? find_held_lock+0x35/0x1d0 |
| [ 24.025486] ? mm_update_next_owner+0x930/0x930 |
| [ 24.030145] ? debug_check_no_locks_freed+0x3c0/0x3c0 |
| [ 24.035315] ? lock_downgrade+0x980/0x980 |
| [ 24.039438] ? __unqueue_futex+0x1c0/0x290 |
| [ 24.043650] ? lock_release+0xa40/0xa40 |
| [ 24.047599] ? fault_in_user_writeable+0x90/0x90 |
| [ 24.052329] ? do_raw_spin_trylock+0x190/0x190 |
| [ 24.056885] ? futex_wake+0x680/0x680 |
| [ 24.060666] ? drop_futex_key_refs.isra.13+0x63/0xb0 |
| [ 24.065745] ? futex_wait+0x6a9/0x9a0 |
| [ 24.069550] ? trace_hardirqs_off+0x10/0x10 |
| [ 24.073845] ? drop_futex_key_refs.isra.13+0x63/0xb0 |
| [ 24.078922] ? futex_wake+0x2ca/0x680 |
| [ 24.082700] ? memset+0x31/0x40 |
| [ 24.085961] ? find_held_lock+0x35/0x1d0 |
| [ 24.090650] ? get_signal+0x7a9/0x16d0 |
| [ 24.094516] ? lock_downgrade+0x980/0x980 |
| [ 24.098662] do_group_exit+0x149/0x400 |
| [ 24.102531] ? do_raw_spin_trylock+0x190/0x190 |
| [ 24.107087] ? SyS_exit+0x30/0x30 |
| [ 24.110517] ? _raw_spin_unlock_irq+0x27/0x70 |
| [ 24.114988] ? trace_hardirqs_on_caller+0x421/0x5c0 |
| [ 24.119999] get_signal+0x73a/0x16d0 |
| [ 24.123704] ? ptrace_notify+0x130/0x130 |
| [ 24.127742] ? ucma_put_ctx+0x26/0x30 |
| [ 24.131517] ? ucma_listen+0x182/0x1f0 |
| [ 24.135390] ? ucma_accept+0x970/0x970 |
| [ 24.139266] ? kasan_check_write+0x14/0x20 |
| [ 24.143474] ? _copy_from_user+0x99/0x110 |
| [ 24.147600] ? ucma_write+0x11f/0x3d0 |
| [ 24.151376] ? ucma_accept+0x970/0x970 |
| [ 24.155240] ? ucma_close_id+0x60/0x60 |
| [ 24.159108] do_signal+0x90/0x1e90 |
| [ 24.162643] ? ucma_close_id+0x60/0x60 |
| [ 24.166504] ? __vfs_write+0xf7/0x970 |
| [ 24.170280] ? setup_sigcontext+0x7d0/0x7d0 |
| [ 24.174573] ? kernel_read+0x120/0x120 |
| [ 24.178443] ? trace_hardirqs_off+0x10/0x10 |
| [ 24.182756] ? fsnotify+0x7b3/0x1140 |
| [ 24.186474] ? exit_to_usermode_loop+0x8c/0x2f0 |
| [ 24.191141] exit_to_usermode_loop+0x258/0x2f0 |
| [ 24.195710] ? trace_event_raw_event_sys_exit+0x260/0x260 |
| [ 24.201229] ? do_syscall_64+0xb7/0x940 |
| [ 24.205184] do_syscall_64+0x6ec/0x940 |
| [ 24.209051] ? _raw_spin_unlock_irq+0x27/0x70 |
| [ 24.213523] ? finish_task_switch+0x1c1/0x7e0 |
| [ 24.217992] ? syscall_return_slowpath+0x550/0x550 |
| [ 24.222910] ? syscall_return_slowpath+0x2ac/0x550 |
| [ 24.227821] ? prepare_exit_to_usermode+0x350/0x350 |
| [ 24.232813] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 |
| [ 24.238154] ? trace_hardirqs_off_thunk+0x1a/0x1c |
| [ 24.243581] entry_SYSCALL_64_after_hwframe+0x42/0xb7 |
| [ 24.248746] RIP: 0033:0x446a49 |
| [ 24.251909] RSP: 002b:00007fb425dffda8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca |
| [ 24.259591] RAX: fffffffffffffe00 RBX: 00000000006e29fc RCX: 0000000000446a49 |
| [ 24.266837] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006e29fc |
| [ 24.274081] RBP: 00000000006e29f8 R08: 0000000000000000 R09: 0000000000000000 |
| [ 24.281323] R10: 0000000000000000 R11: 0000000000000246 R12: 006d635f616d6472 |
| [ 24.288563] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 0000000000000005 |
| [ 24.295820] |
| [ 24.297425] Allocated by task 4228: |
| [ 24.301034] save_stack+0x43/0xd0 |
| [ 24.304464] kasan_kmalloc+0xad/0xe0 |
| [ 24.308160] kmem_cache_alloc_trace+0x136/0x740 |
| [ 24.312806] rdma_create_id+0xd0/0x630 |
| [ 24.316665] ucma_create_id+0x35f/0x920 |
| [ 24.320611] ucma_write+0x2d6/0x3d0 |
| [ 24.324208] __vfs_write+0xef/0x970 |
| [ 24.327804] vfs_write+0x189/0x510 |
| [ 24.331316] SyS_write+0xef/0x220 |
| [ 24.334742] do_syscall_64+0x281/0x940 |
| [ 24.338605] entry_SYSCALL_64_after_hwframe+0x42/0xb7 |
| [ 24.343764] |
| [ 24.345363] Freed by task 4231: |
| [ 24.348617] save_stack+0x43/0xd0 |
| [ 24.352048] __kasan_slab_free+0x11a/0x170 |
| [ 24.356360] kasan_slab_free+0xe/0x10 |
| [ 24.360134] kfree+0xd9/0x260 |
| [ 24.363210] rdma_destroy_id+0x821/0xda0 |
| [ 24.367243] ucma_close+0x100/0x2f0 |
| [ 24.370842] __fput+0x327/0x7e0 |
| [ 24.374092] ____fput+0x15/0x20 |
| [ 24.377343] task_work_run+0x199/0x270 |
| [ 24.381205] do_exit+0x9bb/0x1ad0 |
| [ 24.384631] do_group_exit+0x149/0x400 |
| [ 24.388492] get_signal+0x73a/0x16d0 |
| [ 24.392175] do_signal+0x90/0x1e90 |
| [ 24.395690] exit_to_usermode_loop+0x258/0x2f0 |
| [ 24.400242] do_syscall_64+0x6ec/0x940 |
| [ 24.404102] entry_SYSCALL_64_after_hwframe+0x42/0xb7 |
| [ 24.409260] |
| [ 24.410860] The buggy address belongs to the object at ffff8801b94ced80 |
| [ 24.410860] which belongs to the cache kmalloc-1024 of size 1024 |
| [ 24.423658] The buggy address is located 480 bytes inside of |
| [ 24.423658] 1024-byte region [ffff8801b94ced80, ffff8801b94cf180) |
| [ 24.435589] The buggy address belongs to the page: |
| [ 24.440494] page:ffffea0006e53380 count:1 mapcount:0 mapping:ffff8801b94ce000 index:0x0 compound_mapcount: 0 |
| [ 24.450434] flags: 0x2fffc0000008100(slab|head) |
| [ 24.455077] raw: 02fffc0000008100 ffff8801b94ce000 0000000000000000 0000000100000007 |
| [ 24.462944] raw: ffffea0006e8ad20 ffff8801dac01848 ffff8801dac00ac0 0000000000000000 |
| [ 24.470793] page dumped because: kasan: bad access detected |
| [ 24.476484] |
| [ 24.478084] Memory state around the buggy address: |
| [ 24.482985] ffff8801b94cee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 24.490316] ffff8801b94cee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 24.497649] >ffff8801b94cef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 24.504991] ^ |
| [ 24.511460] ffff8801b94cef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 24.518793] ffff8801b94cf000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 24.526121] ================================================================== |
